print('hello world')

# 单行注释

"""
多行注释
"""

'''
多行注释
'''
print("hello world","human",sep=",")

print(r"\n")

a = "Hello"
print(a[0])  # H
print(a[1:3]) # el

name = "Trump"
age = 59.5
print("My name is %s,and age is %f" % (name,age))

print("{}{}".format(12,98))

a = "hello"
b = "world"
print("{1}{0}{1}".format(a,b))

print("{a}{b}{a}".format(a = "hello",b = "world"))  # worldhelloworld
print("{a}{b}{a}".format(b = "world",a = "hello"))  # worldhelloworld

print(f'I\'m {a},You\'re {b}')

print("Your name is lucy\nMy name is wilia\nWe're friend.")

print((int)(1/10))